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Docker Networking

#docker   #networking   #network  

Table of Content

Docker Networking#

Out of the box docker has three type of networks

docker network ls
#
NETWORK ID     NAME      DRIVER    SCOPE
518ee43b204b   bridge    bridge    local
b995620ac824   host      host      local
0ca19644e7f5   none      null      local

Bridge Network#

This is the default network that container attached by default, the docker engine create a network interface on host usually with an ip address 172.17.0.1/16 and the container get ip address from dhcp config on this interface. run docker network inspect bridge for more information on the configuration and container attach to this network.

Host Network#

Host network use the host’s network and not receive an ip address. They are virtually a service spawned on the host’s network and consume the host’s ports.

docker run -it --rm \
--network=host \
busybox

None Network#

A none network doesn’t provide any networking capability to the container which means the container is like a black box to the host. The host or any other container won’t be able to communicate with the container.

docker run -it --rm \
--network=none \
busybox

ifconfig
# only localhost exists 
lo      Link encap:Local Loopback  
        inet addr:127.0.0.1  Mask:255.0.0.0
        ...

MacVLAN Network#

docker network create -d macvlan \
--subnet=192.168.100.0/24 \
--gateway=192.168.100.1 \
-o parent=wlo1 \
pub_net

docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
518ee43b204b   bridge    bridge    local
b995620ac824   host      host      local
0ca19644e7f5   none      null      local
2e404239b3e6   pub_net   macvlan   local

docker run -it --rm \
--network=pub_net \
busybox

Note

macvlan can only communicate with other container on the same vlan

Custom bridge#

docker network create -d bridge my_bridge

docker network ls
#
NETWORK ID     NAME        DRIVER    SCOPE
518ee43b204b   bridge      bridge    local
b995620ac824   host        host      local
267224cb8d5c   my_bridge   bridge    local
0ca19644e7f5   none        null      local

docker network inspect my_bridge
#
[
    {
        "Name": "my_bridge",
        "Id": "267224cb8d5cb2d4626549c4082fcb7ff58f14ed67365ddc301de1e1ed8f1b23",
        "Created": "2023-07-06T15:24:31.8552333+03:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.18.0.0/16",
                    "Gateway": "172.18.0.1"
                }
            ]
        },

Tip

A bridge network construct its own DNS. The hostname of each container mapped to its IP address

Demo#

Show using DNS on custom bridge network

container1
docker run -it --rm \
--hostname=drone \
--name=done_c \
--network=my_bridge \
busybox
container2
docker run -it --rm \
--hostname=ai \
--network=my_bridge \
busybox
container1
hostname -i
172.18.0.2

hostname -f
drone

ping ai
64 bytes from 172.18.0.3: seq=0 ttl=64 time=0.120 ms
container2
hostname -i
172.18.0.3

hostname  -f
ai

ping drone
PING drone (172.18.0.2): 56 data bytes
64 bytes from 172.18.0.2: seq=0 ttl=64 time=0.100 ms

Add network adapter to container#

docker network connect <network> <container>

Demo#

  • Add default bridge to running container with my_bridge network
container1
docker run -it --rm \
--hostname=drone \
--name=drone_c \
--network=my_bridge \
busybox
connect
docker network connect bridge drone_c

ifconfig 
eth0      Link encap:Ethernet  HWaddr 02:42:AC:12:00:02  
          inet addr:172.18.0.2  Bcast:172.18.255.255  Mask:255.255.0.0
          ...

eth1      Link encap:Ethernet  HWaddr 02:42:AC:11:00:05  
          inet addr:172.17.0.5  Bcast:172.17.255.255  Mask:255.255.0.0
          ...
disconnect
docker network disconnect bridge drone_c

resources#